These are good plugs however at over $300 each after shipping and tax, I believe that massive electrode plugs are more cost effective if you clean them more frequently. I have been using these fine wire plugs since 2016 and havent experienced a big enough difference to justify the price.
David K
Verified Purchase
TEMPEST SPARK PLUG UREM38S
April 17, 2024
Pricey but worth it. Cost even for the number of times to replace massive electrode types due to long life. Much better ignition for marginal (lean) mixtures
David P
Verified Purchase
TEMPEST SPARK PLUG UREM38S
February 27, 2024
I like Tempest plugs in general as they tend to have better resistance values than Champions. However, the wrenching on tempest plugs are lower on the plug than Champions and this presents a problem when utilizing spark plug gasket CHT probes. There is interference between the wrenching and the wall of the counterbore for the spark plug on Lycoming engines. I have had to utilize a champion plug in that instance.
Gary S
Verified Purchase
TEMPEST SPARK PLUG UREM38S
November 11, 2023
Arrived properly gapped and with normal resistance
William H
Verified Purchase
TEMPEST SPARK PLUG UREM38S
November 10, 2023
White B
Verified Purchase
TEMPEST SPARK PLUG UREM38S
August 22, 2023
After having fowled plugs and so many issues, I received recommendations for these plugs from many pilots. Although I though it was crazy to spend this kind of money for plugs, in the long run it has saved many headaches and reduced the cost of hiring an A & P to keep servicing the old plugs.
Leslie L
Verified Purchase
TEMPEST SPARK PLUG UREM38S 12 PACK
March 10, 2023
White B
Verified Purchase
TEMPEST SPARK PLUG UREM38S
July 6, 2022
Long life and reliable.
Milon W
Verified Purchase
TEMPEST SPARK PLUG UREM38S
June 19, 2022
Peter T
Verified Purchase
TEMPEST SPARK PLUG UREM38S 12 PACK
May 19, 2022
Had better luck with tempest than with champion. Appreciate the stated resistance ranges.
Vance B
Verified Purchase
TEMPEST SPARK PLUG UREM38S
May 19, 2022
I previously installed these in the lower plugs in an IO-540 engine to eliminate lead fouling. When the standard plugs in the tops needed replacing I upgraded to the Tempest fine wire plugs. The engine now runs noticeably smoother and the mag drops are minimal. I also noticed a drop in EGTs during takeoff. I recommend these spark plugs.
Free S
Verified Purchase
TEMPEST SPARK PLUG UREM38S
September 16, 2021
product performed as expected
Ed T
Verified Purchase
TEMPEST SPARK PLUG UREM38S
September 14, 2021
Gerald S
Verified Purchase
TEMPEST SPARK PLUG UREM38S
September 7, 2021
I bought the fine wire spark plug. To put in the bottom of my cylinder 3. Although the compression still reads 71 it seems to pump oil on that bottom plug. I have only put 4 hours on it so far. But performance seems to be the same as the massive one. I change oil and rotate plugs every 25 hours. I’ll let you know.
Jay B
Verified Purchase
TEMPEST SPARK PLUG UREM38S
July 11, 2021
I have purchased these before and really like them!
Edwin G
Verified Purchase
TEMPEST SPARK PLUG UREM38S
June 16, 2021
I have purchased these before and really like them!
Edwin G
Verified Purchase
TEMPEST SPARK PLUG UREM38S
June 16, 2021
Yes, these plugs are expensive but hey live up to the hype! I had massive plugs that were always fouling in the bottom position of a couple cylinders. The engine was never smooth because of this. Now with the fine wire plugs the engine purrs. Just wish they were not so expensive
Eaa C
May 11, 2021
They may be spendy, but they last a long time and I have never had one foul. The set that these are replacing lasted for just under 1,100 hours.
Steve R
April 21, 2021
Very pleased with communication with staff and speed of process and delivery Purchased items packed well and received in excellent condition.
Stan O
March 15, 2021
I replaced the bottom four plugs in my Lycoming O-360 and they were an immediate improvement over the older massive electrode plugs. The engine started easier, and there was no detectable fouling which was a frequent problem in the past after engine start. Its a hefty investment, so Ill wait to replace the top plugs, but worth it so far.
Red B
September 28, 2020
Following up on my provisional report of last November (2018), my first removal of the Tempest plugs was recently accomplished, after 34 flight hours of exceptionally smooth, trouble-free operation however, to my great surprise one of the removed plugs was missing its center iridium electrode. This plug was from the bottom position in the number 3 cylinder, and a flashlight inspection of the empty hole revealed the detached electrode, still sitting just above the point where the base of the plug had extended during operation.
I immediately notified Tempest Aero Group, and that same day they shipped out eight new plugs, via overnight UPS. I returned the one with the missing electrode, as well as the one that had seemed particularly prone to cross-threading, but was advised to retain the other six as spares - a nice and appreciated touch.
Amazingly enough, the missing electrode had caused *no* discernible changes in engine operation, including no difference in EGTs, CHTs and individual magneto drops during pre-flight run-ups - *or* during brief in-flight checks. My guess is that the gap between the remaining portion of the center electrode, and the unaffected side post, was so close to nominal specifications that there was no degradation in performance.
The new set still was a bit more challenging to initially engage in the cylinder threads than the Champion iridium plugs had been - the latter occurring over 2,000 flight hours of routine removals and reinstallations - but a surgical touch here and there ultimately resulted in proper seating of all eight new plugs. (Tempest recommends use of its T-556 graphite-based anti-seize product, which I now have on order.)
Mark
October 12, 2019
Great product!
I have purchased these fine wire plugs before!
Ed
September 10, 2019
O-360-A4M - Much smoother idle than the Champion REM40E plugs that I replaced. Noticeably smoother operation in cruise as well. All plugs measured between 1000 and 1500 ohms.
Mark
December 6, 2018
I like the quality and performance of the
Tempest Spark Plugs best. My last set were the Tempest Massive Electrodes that I switched to from the Champion Brand because of radio noise which went away with the Tempest Plugs. My current set for my
RV9A are the Tempest Fine Wire Plugs. They too are radio quiet and give great performance.
Dwight T
October 7, 2018
I replaced my defective Champion plugs with these, and they work great.
Although I hear that Champion has fixed their resistor problems, their denial of a problem (and silence on their fix for it) have made me a Tempest fan!
Dan M
June 15, 2018
engine sounds and runs great. IO-360A1B6 RV-8A
Flash
May 25, 2018
Great spark plug! I rarely have to replace these before they’re worn beyond spec. I highly recommend tempest spark plugs
Cordaro S
April 26, 2018
I replaced six lower plug on TIO 540. The plugs prior to replacement were new massive plugs, however it was prone to lead fouling after less than 10 hours of flight. I lean it aggressively but unforgiving lead has set plug #4 & #6 foul up. The fine wire in my belief is a must on larger lycoming or continental engine.
Highly recommend the fine wire plugs, price is worth it. In my opinion it will pay for itself.
I am a Tempest convert now.
Alexander L
March 25, 2018
There are 12 spark plugs x 2 engines in a Seneca. Had Champions before replacing all the plugs with these winners.
No hard starts, no fouling and they look very cool with the stainless bodies.
The bonus is lower cost to buy and better fuel economy.
William C
March 15, 2018
I have used iridium plugs in my 152 for nearly 30 years, it completely stopped the lead fouling that that particular engine is prone to. But when I got this old 172 recently and had trouble starting it, I was not sure what to try so I went to iridium plugs on it. The students can now start this thing on their own without my help, iridium plugs are magic! There was nothing wrong with the old plugs I took out, they showed signs of a rich running engine but other than that no problems, certainly not problems that would indicate a difficult to start engine. But iridium plugs have cleared up that problem once and for all. The cost is well worth it, Ive been using the same plugs for over a thousand hours in my 152 and they are still great, so it is a false economy to not buy iridium plugs because you think they are too expensive. If there were six stars, I would give them that rating LOL
Lisa
January 20, 2018
Certified for and a great plug for Lycoming O360. All resistances were between 995 and 1300 ohms. Gaps checked good, no adjustments needed.
Don
November 29, 2017
We use these plugs in our Pratt and Whitney R1340 engines and have very good luck with them. I highly recommend them to anyone.
Noe A
August 11, 2017
Good Buy
Charles S
July 21, 2017
I always buy Tempest spark plugs.
Nickel coating, resistors that are superior and at competitive priceing
I WILL consider any Tempest product before others..
Keith P
July 20, 2017
Thanks for the great service. The Tempest plugs arrived on time and as advertised.
Im pleased not only with their performance but also with their polished appearance which makes the engine look great.
Jim C
July 8, 2017
Im slowly replacing my champion with these. they seem to be less prone to lead fouling. like the other reviewer said, time will tell. so far so good.
David B
March 26, 2017
I've had fine where plugs in my Grumman Cheetah 0320 for about two years, they really work well and I always get the same mag drop with the upper or lower plugs. While they work perfectly, the exterior of the plugs corroded excessively. I mentioned this to Brian Cox at the Tempest booth at Sun n fun, he said for a short while they had an issue with their plating vendor. I sent him some pictures and the date codes, and I just received a completely new set of plugs! This type of customer service is remarkable-I will remain a staunch Tempest customer.
Dennis D
May 7, 2015
very nice to go to model of airplane
Wes N
April 29, 2014
Smoother idle, lower CHT... Time will tell.
Kevin F
March 7, 2014
Last much longer and foul much less than standard massive plugs.
The downside is the high price.
Jonathan G
Verified Purchase
TEMPEST SPARK PLUG UREM38S
June 4, 2021
Better than standard plugs , but very expensive.
Stoner A
June 19, 2020
The ones I replaced were less than 2 years old. They were fine and mag checks were a 75 drop. Champ 40E. I always leaned to Lycoming recommendations , but I seem to have lead problems more often than not. Most recent, did a short flight, shut down, restarted after about 10mins and thought the engine was gonna fall off. Did everything I could think of to clean it out with no tools on me and was able to return to home. That left me in a bad way especially if I had been else where. Lead was the problem. Long story short, I went to theses plugs. I have about an 1 1/2 on them. Mag drop was 50 and at cruise they are smooth, but so were the Champ. I feel it was a good investment for the long run, time will tell. The reason for 4 stars, very pricy. I bought the plug socket that fit theses plugs and took my time putting them in and all went well.
Gary
January 9, 2020
Thomas F
January 12, 2019
This is a provisional rating, subject to revision based on operational performance. In the meantime, however, these plugs seem *extremely* prone to cross-threading - with subsequent damage to the Helicoil threads of the cylinders spark plug hole - upon attempted installation.
With one cylinder in particular, the top plug was almost impossible to start into the hole without cross-threading - yet two brand new Unison plugs could be engaged in the same hole with ease.
Definitely YMMV - but do be especially careful when attempting to install these plugs.
Operational evaluation to follow later.
FWIIW....
Mark
November 26, 2018
Nice Spark Plugs bought with new Kelly Harness My birds starting quicker and running smoother now. The Fit and Finish of these nickel plated plugs is very good.
Dwb
August 6, 2018
great spark plugs but too expensive. Also, I wish there was a better and inexpensive way to figure out the spark plugs condition etc...
Max
June 2, 2018
Good value for money
Jan H
April 26, 2018
I will rate it 5 stars as to performance and long life as well as less susceptible to lead fouling.
The 7/8 flat area where the deep socket slides over is not as deep as a Champion Spark Plug. In areas near baffling its really handy to use a box end wrench to remove the plug. And if you are stranded away from home with a fouled plug to remove and install with a box end wrench. If you are qualified and experienced with torque.
Mw
February 19, 2018
Plane runs well so far. Had to regap a few plugs out of the box. Quality control by Tempest?? Lost confidence in Champion after their spark plug resistance issue and magneto point redesign. Hopefully Tempest wont go the same way with their quality control.
Steve
December 13, 2017
performs as advertised.
J. C
March 31, 2017
11 of the 12 plugs had scratches / gouges in the ceramic insulator where the lead goes in.
Lee
October 2, 2017